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Troubleshooting Alien Swarm: How to Fix Common Problems and Isuses

Common fixes:

Clear the Cache of Your PC or Console
Update Alien Swarm game Licenses (PS Only).
Power cycling your console (PlayStation 4 & Xbox One): Turn off your console » unplug power-cable for 1min. » Plug power-cable back » restart console » Run Alien Swarm again.
Install Missing Multiplayer packages.

How to Fix Alien Swarm Game Server Connection Problems:

Reset Winsock:
- Press » Search bar » and type CMD. Now, Right-click Command Prompt when it comes up as a result and select Run as administrator.
  In Command Prompt, type 'netsh winsock reset' and hit Enter (on your keyboard).
  Now, Restart your computer and Launch Alien Swarm and check if the issue persists.
Close all other Internet connected apps.
Restart your network (modem or wi-fi).

ABOUT THE GAME

Alien Swarm: Reactive Drop extends Alien Swarm, bringing more of everything: maps, aliens, game modes, guns... And most importantly Steam Workshop support.Tactical co-op for up to 8 players with a top-down perspectiveSteam Workshop support for community maps and challengesNew co-operative campaignsChallenges: Modifications of the game, just like Mutations in Left 4 Dead 2PvP: Deathmatch, Gun Game, Instagib, and Team DeathmatchSingleplayer: Play with improved bots on all our official mapsNew Aliens: HL2 antlion guards and moreNew Weapons: Desert Eagle, Devastator, and Combat Rifle, with more to comeOver 100 Steam achievementsLeaderboards: compete with your friends for the fastest mission completionImproved spectating: see hacking minigames and mouse movements in real time